Backer Rod is a foam material used to fill large checks and gaps between logs. It also provides support for chinking and sealants. Its primary purpose is act as a "bond-breaker" and promote two-point adhesion, giving the joint and sealing material the ability to compress and expand as logs move.
Sealants and chinking do not adhere to the backer rod—only to the log surfaces of the joint—allowing for movement without damaging the sealing material. I-Wood Care distributes a number of types and profiles of backer rod including the unique Grip Strip™.
You should select backer rod based upon your particular needs. A closed-cell type is more moisture resistant, and an Open-cell type is recommended to speed drying. Backer rod also serves by adding insulation value and reducing the amount of caulking or chinking needed.
Note: This is a closed cell backer rod that we carry.
Made in the U.S.A.